Sound check cut short by leader of orchestra (5)

I believe the answer is:

audio

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'sound' is the definition.
(audio means sound)

'check cut short by leader of orchestra' is the wordplay.
'check cut short' becomes 'audi' (I can't justify this - if you can you should give a lot more credence to this answer).
'by' is a charade indicator (letters next to each other).
'leader of' indicates taking the first letters.
The first letter of 'orchestra' is 'o'.
'audi'+'o'='AUDIO'

Can you help me to learn more?

(Other definitions for audio that I've seen before include "Denoting sound" , "Reproduction of recorded sound" , "Sound recording" , "Prefix signifying sound or hearing" , "Sound broadcast" .)

I've seen this clue in The Guardian.

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